Integer Overflow Vulnerability in Linux Kernel's XSK Package
Summary
CVE-2025-21997: In the Linux kernel, the following vulnerability has been resolved: xsk: fix an integer overflow in xp_create_and_assign_umem() Since the i and pool->chunk_size variables are of type 'u32', their product can wrap around... Affects linux versions < 6.1.133-1. Fixed in 6.1.133-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware and software interactions. It is known for its robustness, flexibility, and extensive support for various hardware architectures. The kernel's XSK (eXpress Data Path Socket) feature enhances packet processing performance, particularly for high-speed networking. However, it is susceptible to vulnerabilities that can compromise system integrity and security.
Vulnerability Detail
In the Linux kernel, an integer overflow vulnerability has been identified in the xp_create_and_assign_umem() function of the XSK implementation. This issue arises from the multiplication of two unsigned 32-bit integers (i and pool->chunk_size), which can exceed the maximum value representable by a 32-bit integer. When this overflow occurs, the resulting value is cast to a 64-bit integer, potentially leading to two different XDP buffers pointing to the same memory area. This could allow for unauthorized memory access, data corruption, or system crashes, posing significant risks to system stability and security.
How To Fix
Minimum fixed version
6.1.133-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, no specific workarounds have been provided for this vulnerability. It is recommended to apply the patch as soon as it becomes available to mitigate risks.
Conclusion
The CVE-2025-21997 vulnerability in the Linux kernel's XSK implementation poses serious risks due to potential memory access issues. Users are strongly encouraged to update their systems to the latest patched version to mitigate these risks. Regular monitoring for vulnerabilities using tools like Vulert can help maintain system security.
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FAQ
CVE-2025-21997 is an integer overflow vulnerability in the Linux kernel's XSK implementation, which can lead to memory access issues.
Exploiting this vulnerability may allow unauthorized access to memory, leading to data corruption or system crashes.
Yes, users are advised to update their Linux kernel to the latest version that includes the fix for this vulnerability.
While no specific workarounds are available, it is crucial to monitor for updates and apply them as soon as possible.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Visit Vulert Scanner to check your application without needing to sign up.
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